circuitpython/teensy/core/usb_serial.h

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/* Teensyduino Core Library
* http://www.pjrc.com/teensy/
* Copyright (c) 2013 PJRC.COM, LLC.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* 1. The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* 2. If the Software is incorporated into a build system that allows
* selection among a list of target devices, then similar target
* devices manufactured by PJRC.COM must be included in the list of
* target devices and selectable in the same manner.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef USBserial_h_
#define USBserial_h_
#if defined(USB_SERIAL) || defined(USB_SERIAL_HID)
#include <inttypes.h>
#if F_CPU >= 20000000
// C language implementation
#ifdef __cplusplus
extern "C" {
#endif
int usb_serial_getchar(void);
int usb_serial_peekchar(void);
int usb_serial_available(void);
int usb_serial_read(void *buffer, uint32_t size);
void usb_serial_flush_input(void);
int usb_serial_putchar(uint8_t c);
int usb_serial_write(const void *buffer, uint32_t size);
void usb_serial_flush_output(void);
extern uint32_t usb_cdc_line_coding[2];
extern volatile uint8_t usb_cdc_line_rtsdtr;
extern volatile uint8_t usb_cdc_transmit_flush_timer;
extern volatile uint8_t usb_configuration;
#ifdef __cplusplus
}
#endif
#define USB_SERIAL_DTR 0x01
#define USB_SERIAL_RTS 0x02
// C++ interface
#ifdef __cplusplus
#include "Stream.h"
class usb_serial_class : public Stream
{
public:
void begin(long) { /* TODO: call a function that tries to wait for enumeration */ };
void end() { /* TODO: flush output and shut down USB port */ };
virtual int available() { return usb_serial_available(); }
virtual int read() { return usb_serial_getchar(); }
virtual int peek() { return usb_serial_peekchar(); }
virtual void flush() { usb_serial_flush_output(); } // TODO: actually wait for data to leave USB...
virtual size_t write(uint8_t c) { return usb_serial_putchar(c); }
virtual size_t write(const uint8_t *buffer, size_t size) { return usb_serial_write(buffer, size); }
size_t write(unsigned long n) { return write((uint8_t)n); }
size_t write(long n) { return write((uint8_t)n); }
size_t write(unsigned int n) { return write((uint8_t)n); }
size_t write(int n) { return write((uint8_t)n); }
using Print::write;
void send_now(void) { usb_serial_flush_output(); }
uint32_t baud(void) { return usb_cdc_line_coding[0]; }
uint8_t stopbits(void) { uint8_t b = usb_cdc_line_coding[1]; if (!b) b = 1; return b; }
uint8_t paritytype(void) { return usb_cdc_line_coding[1] >> 8; } // 0=none, 1=odd, 2=even
uint8_t numbits(void) { return usb_cdc_line_coding[1] >> 16; }
uint8_t dtr(void) { return (usb_cdc_line_rtsdtr & USB_SERIAL_DTR) ? 1 : 0; }
uint8_t rts(void) { return (usb_cdc_line_rtsdtr & USB_SERIAL_RTS) ? 1 : 0; }
operator bool() { return usb_configuration && (usb_cdc_line_rtsdtr & (USB_SERIAL_DTR | USB_SERIAL_RTS)); }
size_t readBytes(char *buffer, size_t length) {
size_t count=0;
unsigned long startMillis = millis();
do {
count += usb_serial_read(buffer + count, length - count);
if (count >= length) return count;
} while(millis() - startMillis < _timeout);
setReadError();
return count;
}
};
extern usb_serial_class Serial;
#endif // __cplusplus
#else // F_CPU < 20 MHz
// Allow Arduino programs using Serial to compile, but Serial will do nothing.
#ifdef __cplusplus
#include "Stream.h"
class usb_serial_class : public Stream
{
public:
void begin(long) { };
void end() { };
virtual int available() { return 0; }
virtual int read() { return -1; }
virtual int peek() { return -1; }
virtual void flush() { }
virtual size_t write(uint8_t c) { return 1; }
virtual size_t write(const uint8_t *buffer, size_t size) { return size; }
size_t write(unsigned long n) { return 1; }
size_t write(long n) { return 1; }
size_t write(unsigned int n) { return 1; }
size_t write(int n) { return 1; }
using Print::write;
void send_now(void) { }
uint32_t baud(void) { return 0; }
uint8_t stopbits(void) { return 1; }
uint8_t paritytype(void) { return 0; }
uint8_t numbits(void) { return 8; }
uint8_t dtr(void) { return 1; }
uint8_t rts(void) { return 1; }
operator bool() { return true; }
};
extern usb_serial_class Serial;
#endif // __cplusplus
#endif // F_CPU
#endif // USB_SERIAL || USB_SERIAL_HID
#endif // USBserial_h_